Today the Northern Flicker baby birds in the cavity of the Birch tree across the street are big enough to be seen during feeding time!Look at this videoof the Mother Northern Flicker feeding a bunch of babies! I won't get into a long description of it, the pictures say it all...

They squawk & sound exactly like the parents sound, only tiny.

Almost all, except that the sound is hard to hear over the traffic of the city, and really surprisingly loud! They sound just like their parent's mating call, except they sound really tiny. But you can recognize the Flicker call coming out of the cavity of the Birch tree.